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JOHN H. EDDY, OF 'TAUNTON, MASSACHUSETTS.

Letters Patent No. 80,537, dated August 4, 1868.

IMPROVEMENT IN GUPOLA-FURNAGES.

@he .Stlgttnle rtferttt. tu in tlgtse-tttttts tant rmt making part of the smite.

TO ALL WIIOM IT MAY CONCERN:

Be it known that I, JOHN H. EDDY, of Taunton, in the county of Bristol, and State of Massachusetts, have invented a new and useful Improvement in Cupola-Furnaces and I do hereby declare that the following' is a full, clear, and exact description'thereof, reference being had to the accompanying drawings, making a. part of' this specification, in which- A Figure 1 represents a-cupola-furnace, with the improvement attached.

Figure 2, a sectional view of the interior of the furnace, and

Figure 3 the bottom.

lA represents the shell or exterior; B, the lining; C C C, the columns, supporting the furnace at cl, and a plate for the support ofthe chimney at'e. Fshows the bottom; H, the wind-pipe; I, the wind-chamber, within the furnace; and s s, s, small holes for the escape of the blast.

The nature of my invention consists in introducing the blast into the furnace at its centre, and not at.i ts sides, as in theunethords heretofore used.

I construct my furnace-in any of the known forms, with the usual appendages of such furnaces, except that I do not apply thereto the tuyeres and sight-heles generally used. From Whatever apparatus maybe used to furnish the blast, I lead a pipe to the ground or oor, directly under-the centre ofthe furnace, and from this point it passes u'p in a direct line (as shown at I-I) to the interior of the furnace, and upon its upper end, within the furnace, is placed the air orlwind'chamber I. This. air-chamber may be made of fire-brick, but, for convenience, it is preferable that it be made of iron, andxcoated upon its exterior with {ire-clay. The bottom is in two parts, as shown in iig. 3, hinged to the furnace at its outer sides, and is secured in its: place, in the usual manner, by means of a stake or prop, which, as usual, is knocked away when it is desired to drop the bottom at the close of the blast.

By the use of the blast as commonly introduced, (viz, into the sides of the-furnace it is found that the greatest heat is.- at the outer sides of the mass of coal. und iron within the furnace, and oftentimes there is a. coreA or portion in the centre that is never heated to the melting-point. This is ventirely remedied by the improvement herein described. It has also'been fou-nd, by actual experiments, that quite a. large per cent. in the amount of coal required t'o melt u. given quantity of iron is saved by introducing the blast into the centre of the furnace, as here shown. l

What I claim as my invention, and desire to secure by Letters Patent, is-

I. The air-chamber I, when used in connection with cupola-furnaces, as above described, and,

2. The introduction of the blast into cupola-furnaces, at the centre thereof, whether the same is aecomplished in the precise method herein described, or by any other means substantially the same.A

JOHN H. EDDY.

Witnesses:

C. H. Tiros, Luni.; T. TALnor. 

